CN117631355A

CN117631355A - Display apparatus

Info

Publication number: CN117631355A
Application number: CN202410043872.XA
Authority: CN
Inventors: 陈建年; 黄育群; 刘懿汉; 王铭典; 蔡永裕
Original assignee: Innolux Display Corp
Current assignee: Innolux Corp
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2024-03-01
Also published as: CN112415794B; CN112415794A; US20210055599A1; US11360338B2

Abstract

The invention provides a display device, which has a normal direction and comprises: back plate, frame, face plate, laminated structure and conductive assembly. The frame is arranged on the back plate, and the back plate supports the frame. The panel is disposed on the frame, and the frame supports the panel. The laminated structure further includes a foam layer disposed on a surface of the frame facing the panel, wherein the laminated structure is located between the panel and the frame in the normal direction. The conductive component is arranged on the surface of the frame and is electrically connected with the backboard.

Description

Display apparatus

The present application is a divisional application of patent application of invention having the name of "display device" with application number 201910772714.7, filed on 21, 08, 2019.

Technical Field

The present invention relates to a display device, and more particularly, to a display device with a panel and a frame bonded by conductive adhesive.

Background

To date, borderless designs have become the mainstay of display devices. Because of cost consideration and appearance requirements, the middle frame of the display device is mostly made of plastic materials. However, the plastic is an insulating material, so that the display device does not form a conducting path, and when the display device is subjected to electrostatic discharge (electrostatic discharge; ESD) test, external static electricity cannot be grounded smoothly, and a result that the test cannot be passed is often generated. Currently, in order to solve the above-mentioned problems, it is necessary to manually add other conductive members to the display device, which results in more complicated assembly process and increased manufacturing cost.

Disclosure of Invention

In order to solve the above problem that external static electricity cannot be smoothly grounded and test cannot pass when the static discharge test is performed on the display device, the present invention provides a display device having a normal direction and comprising: back plate, frame, face plate, laminated structure and conductive assembly. The frame is arranged on the back plate, and the back plate supports the frame. The panel is disposed on the frame, and the frame supports the panel. The laminated structure comprises a foam layer arranged on the surface of the frame facing the panel, wherein the laminated structure is positioned between the panel and the frame in the normal direction. The conductive component is arranged on the surface of the frame and is electrically connected with the backboard.

Drawings

The various aspects of the present disclosure will become more fully apparent from the following detailed description, taken together with the accompanying drawings. It should be noted that the various features are not drawn to scale and are merely illustrative in accordance with practice standard in the industry. In fact, the dimensions of the components may be arbitrarily expanded or reduced for clarity of presentation.

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below, wherein:

fig. 1 shows a schematic top view of a display device according to an embodiment of the invention.

Fig. 2 shows a schematic cross-sectional view of the line A-A' shown in fig. 1.

Fig. 3 is a perspective view showing the conductive paste shown in fig. 1.

Fig. 4 shows a top view of the foam layer shown in fig. 3.

Fig. 5 shows a cross-sectional view of the conductive layer and foam layer shown in fig. 3.

Fig. 6 is a schematic diagram showing a test of a conductive adhesive material according to an embodiment of the invention.

Fig. 7 shows a schematic top view of a display device according to another embodiment of the invention.

Fig. 8 shows a schematic cross-sectional view of line B-B' shown in fig. 7.

Symbol description:

100. 200 display device

110. 210 panel

111. 211 display structural layer

112. 112a, 112b, 212a, 212b polarizing film

120. 220 frame

121. 221 fixing piece

122 conductive assembly

130. 230 conductive adhesive material

131. First adhesive layer

132. Foam layer

132A anchor hole wall

132B hole

133. Conductive layer

134. Second adhesive layer

135 release paper layer

140. 240 backboard

150. 250 reflector

160. 260 light guide plate

170. 270 optical film

180. 280 cushioning member

A-A' line

B-B' line

Maximum width D

F clamp

S steel plate

W1 first width

W2 second width

Detailed Description

The display device of the embodiment of the present invention is described below. However, it will be readily appreciated that the embodiments of the invention provide many suitable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments disclosed are illustrative only, and are not intended to limit the scope of the invention in any way.

Moreover, relative terms such as "below" or "bottom" and "above" or "top" may be used in embodiments to describe one component's relative relationship to another component of the figures. It will be appreciated that if the device of the drawings is turned upside down, the components described as being on the "lower" side would then be components on the "upper" side.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, layers and/or sections, these elements, layers and/or sections should not be limited by these terms, and these terms are used solely to distinguish between different elements, layers and/or sections. Accordingly, a first component, layer, and/or section discussed below could be termed a second component, layer, and/or section without departing from the teachings of some embodiments of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be appreciated that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Fig. 1 shows a schematic top view of a display device 100 according to an embodiment of the invention. It should be noted that the display apparatus 100 may be applied to an electronic device, wherein the electronic device may include a display apparatus, an antenna device, a sensing device or a splicing device, but is not limited thereto. The electronic device may be a bendable or flexible electronic device. The electronic device may include, for example, a liquid crystal (LED), wherein the LED may include, for example, an organic LED (organic light emitting diode; OLED), a sub-millimeter LED (mini LED), a micro LED (micro LED), or a Quantum Dot (QD), which may be, for example, a QLED, QDLED, fluorescence (fluorescence), phosphorescence (phosphorescence), or other suitable materials, and the materials thereof may be arranged and combined arbitrarily, but not limited to these. The antenna device may be, for example, a liquid crystal antenna, but is not limited thereto. The splicing device can be, for example, a display splicing device or an antenna splicing device, but is not limited to this. It should be noted that the electronic device may be any of the above arrangements, but is not limited thereto. The display apparatus 100 is used as an electronic device or a splicing device to illustrate the present disclosure, but the disclosure is not limited thereto.

As shown in fig. 1, the display device 100 includes a panel 110, a frame 120, and a conductive component 122, wherein the panel 110 is disposed and attached in the frame 120 and is supported by the frame 120. Further, the display device 100 has a normal direction, wherein the normal direction is substantially parallel to the Z-axis. In the present embodiment, the conductive member 122 is disposed at one side of the display device 100, but is not limited thereto. A more detailed description of the conductive element 122 is provided below in conjunction with fig. 2.

Fig. 2 shows a schematic cross-sectional view of the line A-A' shown in fig. 1. In the present embodiment, the panel 110 includes a display structure layer 111 and a polarizing film 112 (including 112a and 112 b), wherein the polarizing film 112a and the polarizing film 112b may be disposed on both sides of the display structure layer 111, i.e. the display structure layer 111 is disposed between the polarizing film 112a and the polarizing film 112 b. In the present embodiment, the polarizing film 112a may be disposed on the frame 120, and the display structure layer 111 is disposed on the polarizing film 112 a. The display structure layer 111 includes an upper substrate 111a, a liquid crystal layer 111b and a lower substrate 111c sequentially stacked, wherein the lower substrate 111c is disposed on the polarizing film 112a, the liquid crystal layer 111b is disposed on the lower substrate 111c, and the upper substrate 111a is disposed on the liquid crystal layer 111 b. For example, the upper substrate 111a and/or the lower substrate 111c may be flexible or non-flexible, and the material of the upper substrate 111a and the lower substrate 111c may include glass, sapphire, ceramic, plastic, or other suitable materials, wherein the plastic material may be Polyimide (PI), polyethylene terephthalate (polyethylene terephthalate, PET), polycarbonate (PC), polyethersulfone (PES), polybutylene terephthalate (polybutylene terephthalate, PBT), polyethylene naphthalate (polynaphthalene Ethylene glycolate, PEN) or Polyarylate (PAR), other suitable materials, or combinations thereof, but is not limited thereto. In some embodiments, the liquid crystal layer 111b may include nematic liquid crystal (nematic), smectic liquid crystal (chiral), cholesteric liquid crystal (cholesteric), blue phase liquid crystal (Blue phase), or any other suitable liquid crystal material. It should be understood that although two polarizing films 112a and 112b are shown on the upper and lower sides of the display structure layer 111 in the present embodiment, the number and positions of the polarizing films 112 can be adjusted as required by those skilled in the art.

As shown in fig. 2, the display device 100 further includes a conductive adhesive 130, a back plate 140, a reflective sheet 150, a light guide plate 160, an optical film 170, and a buffer 180. The panel 110 is adhered to the frame 120 through the conductive adhesive 130. It should be noted that the conductive adhesive 130 is disposed on a surface of the frame 120 facing the panel 110, and the surface is substantially parallel to the X-Y plane (i.e., substantially perpendicular to the Z axis). In the present embodiment, the conductive adhesive 130 is adhered to the polarizing film 112a of the panel 110. In other embodiments, the conductive adhesive 130 may be adhered to the display structure layer 111 of the panel 110.

Referring again to fig. 2, the back plate 140 is disposed under the frame 120 and supports the frame 120. For example, the material of the back plate 140 may include metal, any other suitable material, or a combination of the foregoing, but is not limited thereto. The display device 100 may optionally further include a fixing member 121 penetrating through the back plate 140 to fix the frame 120 to the back plate 140. In some embodiments, the fixing member 121 may include a screw, a component for fixing a screw, etc., but is not limited thereto. The display device 100 further includes a conductive component 122 disposed on the frame 120 and electrically connected to the conductive adhesive 130 and the back plate 140, i.e. the conductive component 122 is in direct contact with the conductive adhesive 130 and the back plate 140. Through the conductive adhesive 130, the conductive component 122 and the back plate 140, a conductive path is formed, so that external static electricity can be effectively grounded through the conductive path, and the display device 100 can pass an electrostatic discharge (ESD) test. In addition, in some embodiments, the display device 100 may be provided with a plurality of conductive components 122 electrically connected to the conductive adhesive 130 and the back plate 140. By providing a plurality of conductive elements 122, the average conductive path can be effectively shortened, so as to obtain better grounding effect.

In some embodiments, the material of the conductive component 122 may include, but is not limited to, copper, silver, aluminum, other suitable conductive materials, or combinations of the foregoing. In addition, since the conductive adhesive 130 and the conductive component 122 are disposed on the surface of the frame 120 facing the panel 110, the conductive component 122 at least partially overlaps the conductive adhesive 130 when viewed from the Z-axis direction (from the normal direction). In some embodiments, an insulating tape (not shown) or any other insulating material may be attached to the conductive element 122 near the outer surface for aesthetic and/or insulating purposes.

The conductive adhesive 130 may have a first width W1 in a horizontal direction (e.g., along an X-axis shown in fig. 2), and the edges of the panel 110 to the frame 120 on the same side may have a second width W2 in the horizontal direction, wherein the second width W may be a minimum width from the edges of the panel 110 to the edges of the frame 120. In this embodiment, the first width W1 may be between about 1mm and about 5mm (i.e. 1 mm+.first width w1+.5mm), and the second width W2 may be between about 5mm and about 9mm (i.e. 5 mm+.second width w2+.9mm), but is not limited thereto. It should be understood that the above size ranges are merely examples to more clearly understand the present invention, and do not represent a specific relationship between the first width W1 and the second width W2, and those skilled in the art can adjust the above sizes according to the needs.

The reflective sheet 150 is disposed on the back plate 140, the light guide plate 160 is disposed on the reflective sheet 150, and the optical film 170 is disposed on the light guide plate 160. The buffer 180 is disposed between the frame 120 and the reflective sheet 150, the light guide plate 160 and/or the optical film 170, and is used for absorbing impact and protecting components in the display device 100. For example, the material of the bumper 180 may include rubber, any other suitable elastic material, or a combination of the foregoing, but is not limited thereto.

Fig. 3 is a perspective view of the conductive paste 130 shown in fig. 1. In the present embodiment, the conductive adhesive 130 includes a first adhesive layer 131, a foam layer 132, a conductive layer 133, a second adhesive layer 134 and a release paper layer 135 sequentially stacked along the Z-axis (i.e. along the normal direction). It should be noted that the release paper layer 135 in the present embodiment is used to isolate the adhesive portion of the conductive adhesive 130 before the conductive adhesive 130 is used, so as to avoid adhesion between the foreign matters and the conductive adhesive 130 or between the conductive adhesive 130 itself. In other words, the release paper layer 135 is removed when the conductive adhesive 130 is adhered between the frame 120 and the panel 110, so that it is not located in the display device 100.

In this embodiment, the conductive layer 133 is closer to the frame 120 than the foam layer 132. In other words, the first adhesive layer 131 is configured to adhere to the panel 110, and the second adhesive layer 134 is configured to adhere to the frame 120. Furthermore, in some embodiments, the material of the first adhesive layer 131 may include an acrylate adhesive (acrylate adhesive), and the material of the second adhesive layer 134 may include an adhesive material having conductivity, but is not limited thereto. In other embodiments, both the first glue layer 131 and the second glue layer 134 have electrical conductivity. In addition, the material of the conductive layer 133 may include, for example, aluminum polyester film (Mylar Al), copper polyester film (Mylar Cu), polyimide (PI) plated with a metal layer, any other suitable conductive material, or a combination of the foregoing, but is not limited thereto.

Fig. 4 shows a top view of the foam layer 132 shown in fig. 3. In the present embodiment, the conductive layer 133 is foamed as a foam carrier, and the foam layer 132 is directly formed on the conductive layer 133. Converting the molecules into a three-dimensional network structure through physical and/or chemical crosslinking reaction, wherein the physical crosslinking reaction refers to physical foaming, for example, inert gas can be dissolved in plastic and then released into the wall of the hole through decompression, but the method is not limited to the method; chemical crosslinking refers to chemical foaming, for example, but not limited to, adding a chemical foaming agent, and allowing chemical reaction between molecules to release gas to form cell walls. The foam layer 132 will thus be formed with a plurality of anchor hole walls 132A. The anchor hole walls 132A are fixedly connected to the conductive layer 133 and each form an opening. Even if the foam layer 132 is removed with a solvent, a portion of the foam layer 132 and the anchor hole wall 132A remain on the conductive layer 133, and the opening formed by the anchor hole wall 132A partially exposes the conductive layer 133. The opening formed by the anchor hole wall 132A has a maximum width D in the horizontal direction (X-Y plane) in the range of about 0.05mm to about 0.2mm (i.e., 0.05mm +.maximum width D +.0.2 mm). It should be noted that fig. 4 is a schematic illustration of the anchor hole walls 132A and openings formed therein, and those skilled in the art will appreciate that the openings formed in the anchor hole walls 132A may be randomly distributed, arranged, and have a variety of different widths D and shapes.

Fig. 5 shows a cross-sectional view of the conductive layer 133 and the foam layer 132 shown in fig. 3. As shown in fig. 5, the conductive layer 133 and the foam layer 132 are integrally formed, and the term "integrally formed" as used herein refers to that the conductive layer 133 may be foamed as a carrier of the foam layer 132 by surface treatment, such as corona treatment, but the surface treatment is not limited thereto, and an adhesive layer may not be additionally provided to attach the conductive layer 133 and the foam layer 132. Compared with the conventional design that the conductive layer 133 and the foam layer 132 are attached by the adhesive, the integrally formed structure of the present embodiment can greatly improve the structural strength of the conductive adhesive 130. The foam layer 132 may have a plurality of holes 132B in each direction. Similarly, one skilled in the art will appreciate that the apertures 132B of the foam layer 132 may be randomly distributed, arranged, and formed in a variety of different shapes and/or sizes as desired.

Fig. 6 shows a schematic diagram of testing the shear stress (dynamic overlap shear strength) of the conductive paste 130 by the standard test method ASTM D-1002 according to an embodiment of the invention. In the present embodiment, the width of the conductive adhesive 130 in the Z direction is about 6.2mm, and the length in the Y direction is about 25.4mm. As shown in fig. 6, two sides of the conductive adhesive 130 are respectively attached to one ends of two different steel plates S, wherein the steel plates S are disposed substantially parallel to each other. The steel plate S may be, for example, a 304 stainless steel (SUS 304) steel plate, but is not limited thereto. In this example, after the conductive paste 130 was attached to the steel sheet S, the steel sheet was baked in an oven at 60 ℃ for 1 hour. Next, the other end of the steel plate S to which the conductive paste 130 is not attached is fixed by a jig F. After the clamps F fix the steel plates S, one of the clamps F is pulled upward at a speed of 13mm/min (as shown by an arrow in fig. 6), whereby the force required to break the conductive paste 130 can be measured. In the present embodiment, the conductive adhesive 130 can withstand a force greater than 2.8kgw (the sustainable force > 2.8 kgw) without being damaged.

Fig. 7 shows a schematic top view of a display device 200 according to another embodiment of the invention. Fig. 8 shows a schematic cross-sectional view of line B-B' shown in fig. 7. It should be noted that the display device 200 in this embodiment may include the same or similar parts as the display device 100 shown in fig. 1 and 2, and the same or similar parts will be denoted by similar reference numerals and will not be described again. For example, the display device 200 includes a panel 210, a frame 220, a fixing member 221, a conductive adhesive 230, a back plate 240, a reflective sheet 250, a light guide plate 260, an optical film 270, and a buffer 280. In addition, the panel 210 includes a display structure layer 211 and a polarizing film 212 (including 212a, 212 b), wherein the polarizing film 212a and the polarizing film 212b may be disposed on both sides of the display structure layer 211, that is, the display structure layer 211 is disposed between the polarizing film 212a and the polarizing film 212b, and the display structure layer 211 includes an upper substrate 211a, a liquid crystal layer 211b and a lower substrate 211c sequentially stacked along a normal direction of the display device 200.

The display device 200 in the present embodiment is different from the display device 100 shown in fig. 1 and 2 in that: the fixing member 221 of the display device 200 has a function of a conductive member without additionally providing a conductive member. In the present embodiment, the fixing member 221 penetrates through the back plate 240 and the frame 220, and is electrically connected to the conductive adhesive 230 and the back plate 240 (i.e. contacts the conductive adhesive 230 and the back plate 240). The fixing member 221 (conductive member) is at least partially overlapped with the conductive paste 230 as viewed from the direction of the Z axis (from the normal direction). In addition, as shown in fig. 8, the conductive adhesive 230 is directly attached to the display structure layer 211 of the panel 210 and contacts the polarizing film 212 a. In other embodiments, the conductive adhesive 230 may contact at least one of the display structure layer 211 and the polarizing film 212 a.

In summary, the embodiments of the invention provide a display device with a panel and a frame bonded by conductive adhesive. The conductive adhesive material is electrically connected with the conductive component and the backboard, so that external static electricity is led out or grounded through the conductive path, the structure in the display panel is not affected by the external static electricity, the yield of the display device passing the electrostatic discharge test is improved, the assembly procedure is simplified, and the manufacturing cost is reduced. In addition, the conductive adhesive material in the embodiment of the invention is formed in an integrated manner (i.e. no additional adhesive layer is needed to be arranged to attach the conductive layer and the foam layer), so that the structural strength and the durability of the conductive adhesive material can be greatly improved.

The above-described display device is merely taken as an example, but if the electronic device is a self-luminous display device or other non-display device (for example, an antenna device, etc.), the components belonging to the backlight module such as the reflective sheet, the light guide plate, the optical film, etc. may be omitted appropriately.

Although embodiments of the present invention and their advantages have been disclosed above, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the invention. Furthermore, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification, unless a person skilled in the art would appreciate from the present disclosure that the processes, machines, manufacture, compositions of matter, means, methods and steps are capable of performing substantially the same function or obtaining substantially the same result as the described embodiments. Therefore, the protection scope of the present invention includes the above-mentioned processes, machines, manufacture, compositions of matter, means, methods, or steps, and the features of the embodiments may be mixed or matched without departing from the spirit or the mutual conflict of the present invention. In addition, each claim constitutes a separate embodiment, and the scope of the invention also includes combinations of the individual claims and embodiments.

Claims

1. A display device having a normal direction, and comprising:

a back plate;

the frame is arranged on the backboard, and the backboard supports the frame;

a panel disposed on the frame, the frame supporting the panel;

a laminated structure comprising a foam layer disposed on a surface of the frame facing the panel, wherein the laminated structure is located between the panel and the frame in the normal direction; and

and the conductive component is arranged on the surface of the frame, and is electrically connected with the backboard.

2. The display device of claim 1, wherein the conductive component contacts the back plate.

3. The display device of claim 2, wherein the conductive component contacts at least two surfaces of the back plate, and the at least two surfaces are perpendicular to each other.

4. The display device of claim 2, wherein a portion of the back plate is positioned between the frame and the foam layer in a horizontal direction, and the frame overlaps the back plate.

5. The display device of claim 1, wherein the conductive component contacts the surface of the frame.

6. The display device of claim 1, wherein the laminate structure further comprises a glue layer between the foam layer and the frame.

7. The display device of claim 1, wherein a width of the foam layer is different from a width from an edge of the panel to an edge of the frame.

8. The display device of claim 1, wherein the panel covers the laminate structure.

9. The display device of claim 1, wherein an upper surface of the conductive member is higher than a lower surface of the panel.